diff --git a/random.go b/random.go
index 40cbcf8fa..46754219d 100644
--- a/random.go
+++ b/random.go
@@ -44,7 +44,10 @@ func CRandBytes(numBytes int) []byte {
 	return b
 }
 
-// RandHex(24) gives 96 bits of randomness, strong enough for most purposes.
+// CRandHex returns a hex encoded string that's floor(numDigits/2) * 2 long.
+//
+// Note: CRandHex(24) gives 96 bits of randomness that
+// are usually strong enough for most purposes.
 func CRandHex(numDigits int) string {
 	return hex.EncodeToString(CRandBytes(numDigits / 2))
 }